Reactions between cement and As(III) oxide: The system CaOSiO2As2O3H2O at 25°C

Stronach, S. A.; Walker, N L; Macphee, Donald E.; Glasser, F. P.

doi:10.1016/s0956-053x(97)00029-9

Cited by 36 publications

(18 citation statements)

References 2 publications

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“…According to Stronach et al (1997) and Vandecasteele et al (2002), As (III) and As (V) solubility during S/S was limited by the formation of the sparingly soluble CaHAsO 3 and Ca 3 (AsO 4 ) 2 phases, respectively, which are both pH-dependent. However in this study, negligible As was leached and pH-dependence was not observed (Fig.…”

Section: Ph Dependent Leaching Of Metalsmentioning

confidence: 99%

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

2016

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A new group of MgO-bearing binders has been developed recently which showed improved sustainability and technical performance compared to Portland cement (PC). However, the application of these MgO-bearing binders in the Solidification/Stabilisation (S/S) techniques is very limited. This study investigates the three-year performance of a highly contaminated soil treated by in-situ S/S using MgO-bearing binders and PC. The core quality, strength, permeability and the leaching properties of the S/S materials were evaluated. The effects of binder composition, addition of inorgano-organo-clay (IOC) and the grout content on the properties of the 3-y S/S materials are discussed. It is found that although MgO alone provided negligible strength to the soil, it is superior in immobilising both inorganic and organic contaminants. Replacing MgO by ground granulated blast-furnace slag (GGBS) significantly enhanced the strength while also performed well in immobilising the contaminants. The improved pH buffering capacity was attributed to the low solubilities of brucite and hydrotalcite-like phases formed in the MgO-bearing binders, and was also the reason for the improved performance in stabilising contaminants. The addition of IOC slightly decreased the strength and the permeability of the S/S materials but inconsistent effect on the contaminant immobilisation was found depending on the binder composition. This study showed no degradation of the S/S materials after 3 y exposure to field conditions and has proved the applicability and the advantages of MgO-bearing binders over PC in S/S.

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Section: Ph Dependent Leaching Of Metalsmentioning

confidence: 99%

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

2016

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“…Stronach et al [33] report that hydrated Portland cement limits the solubility of As(III) to 7.0 mmol kg -1 . The authors also observed that this is due to the substantial buffering reserve of Ca(OH) 2 , which is in theory able to immobilise 1 As atom per Ca atom by the formation of the sparingly soluble CaAsO 2 OH.…”

Section: Arsenicmentioning

confidence: 99%

Binding mechanisms of radionuclides to cement

Evans

2008

Cement and Concrete Research

131

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Radionuclide solubility is one of the factors that can determine the 'source term' for potential migration to the far field. Hence, the mechanisms of immobilisation of radionuclides in cements need close study in order to quantify the nature of the binding. The nature of the binding forces in a cement matrix is very species sensitive, so it is difficult to produce a general description. This review summarises the main sorption mechanisms and then details immobilisation mechanisms for many elements.

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“…This process may be responsible for the reduction in leaching from the matrix having cement as well as Ca(OH) 2 . Precipitation and conversion into a non-soluble form (calcium arsenite) in the cement also contribute towards low leaching in the solidified samples [22,23]. Chuanyong et al [24] also reported significant reduction in arsenic mobility with cement because of the formation of the sparingly soluble calcium arsenate.…”

Section: Leachability Indexmentioning

confidence: 99%

Solidification/stabilization of arsenic containing solid wastes using portland cement, fly ash and polymeric materials

Singh

Pant

2006

Journal of Hazardous Materials

229

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Reactions between cement and As(III) oxide: The system CaOSiO2As2O3H2O at 25°C

Cited by 36 publications

References 2 publications

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

Binding mechanisms of radionuclides to cement

Solidification/stabilization of arsenic containing solid wastes using portland cement, fly ash and polymeric materials

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